<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<link href='https://cdn.jsdelivr.net/npm/dragula@3.7.3/dist/dragula.css' rel='stylesheet' />
<script src='https://cdn.jsdelivr.net/npm/dragula@3.7.3/dist/dragula.js'></script>
<script src='../../bundle/dist/index.global.js'></script>
<script>

  document.addEventListener('DOMContentLoaded', function() {

    /* initialize the external events
    -----------------------------------------------------------------*/

    var containerEl = document.getElementById('external-events-list');

    var drake = dragula({
      containers: [ containerEl ],
      copy: true
    });

    new FullCalendar.ThirdPartyDraggable(containerEl, {
      itemSelector: '.fc-event',
      mirrorSelector: '.gu-mirror',
      eventData: function(eventEl) {
        return {
          title: eventEl.innerText.trim()
        }
      }
    })

    //// the individual way to do it
    // var eventEls = Array.prototype.slice.call(
    //   containerEl.querySelectorAll('.fc-event')
    // );
    // eventEls.forEach(function(eventEl) {
    //   eventEl.setAttribute('data-event', JSON.stringify({
    //     title: eventEl.innerText.trim()
    //   }));
    // });
    // new FullCalendar.ThirdPartyDraggable({
    //   mirrorSelector: '.gu-mirror'
    // })

    /* initialize the calendar
    -----------------------------------------------------------------*/

    var calendarEl = document.getElementById('calendar');
    var calendar = new FullCalendar.Calendar(calendarEl, {
      headerToolbar: {
        left: 'prev,next today',
        center: 'title',
        right: 'dayGridMonth,timeGridWeek,timeGridDay'
      },
      editable: true,
      droppable: true, // this allows things to be dropped onto the calendar
      drop: function(arg) {
        // is the "remove after drop" checkbox checked?
        if (document.getElementById('drop-remove').checked) {
          // if so, remove the element from the "Draggable Events" list
          arg.draggedEl.parentNode.removeChild(arg.draggedEl);
        }
      }
    });
    calendar.render();

  });

</script>
<style>

  body {
    margin-top: 40px;
    font-size: 14px;
    font-family: Arial, Helvetica Neue, Helvetica, sans-serif;
  }

  #wrap {
    width: 1100px;
    margin: 0 auto;
  }

  #external-events {
    float: left;
    width: 150px;
    padding: 0 10px;
    border: 1px solid #ccc;
    background: #eee;
    text-align: left;
  }

  #external-events h4 {
    font-size: 16px;
    margin-top: 0;
    padding-top: 1em;
  }

  #external-events .fc-event {
    margin: 10px 0;
    cursor: pointer;
  }

  #external-events p {
    margin: 1.5em 0;
    font-size: 11px;
    color: #666;
  }

  #external-events p input {
    margin: 0;
    vertical-align: middle;
  }

  #calendar {
    float: right;
    width: 900px;
  }

</style>
</head>
<body>
  <div id='wrap'>

    <div id='external-events'>
      <h4>Draggable Events</h4>

      <div id='external-events-list'>
        <div class='fc-event'>My Event 1</div>
        <div class='fc-event'>My Event 2</div>
        <div class='fc-event'>My Event 3</div>
        <div class='fc-event'>My Event 4</div>
        <div class='fc-event'>My Event 5</div>
      </div>

      <p>
        <input type='checkbox' id='drop-remove' />
        <label for='drop-remove'>remove after drop</label>
      </p>
    </div>

    <div id='calendar'></div>

    <div style='clear:both'></div>

  </div>
</body>
</html>
